WO2019230663A1 - Unité de source de lumière - Google Patents

Unité de source de lumière Download PDF

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Publication number
WO2019230663A1
WO2019230663A1 PCT/JP2019/020937 JP2019020937W WO2019230663A1 WO 2019230663 A1 WO2019230663 A1 WO 2019230663A1 JP 2019020937 W JP2019020937 W JP 2019020937W WO 2019230663 A1 WO2019230663 A1 WO 2019230663A1
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WO
WIPO (PCT)
Prior art keywords
shade
light source
magnetic
electromagnet
contact
Prior art date
Application number
PCT/JP2019/020937
Other languages
English (en)
Japanese (ja)
Inventor
一磨 望月
Original Assignee
株式会社小糸製作所
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 株式会社小糸製作所 filed Critical 株式会社小糸製作所
Priority to JP2020522187A priority Critical patent/JPWO2019230663A1/ja
Publication of WO2019230663A1 publication Critical patent/WO2019230663A1/fr

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
    • F21S41/141—Light emitting diodes [LED]
    • F21S41/147—Light emitting diodes [LED] the main emission direction of the LED being angled to the optical axis of the illuminating device
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/60—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution
    • F21S41/68—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on screens
    • F21S41/683—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on screens by moving screens
    • F21S41/689—Flaps, i.e. screens pivoting around one of their edges
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V14/00—Controlling the distribution of the light emitted by adjustment of elements
    • F21V14/08—Controlling the distribution of the light emitted by adjustment of elements by movement of the screens or filters

Definitions

  • the present invention relates to a light source unit, and specifically to a light source unit capable of changing light distribution.
  • a headlight for an automobile is known that can change emitted light into a low beam that illuminates the front at night and a high beam that illuminates far away from the low beam.
  • Patent Document 1 listed below describes such a vehicular lamp.
  • the light source unit of the vehicle lamp described in Patent Document 1 below includes a shade that is supported rotatably and blocks a part of light emitted from the light source, and an electromagnet having a core.
  • the shade is provided with a magnetic portion made of a magnetic material, and the shade is rotated by the magnetic force of the electromagnet acting on the magnetic portion of the shade.
  • the shade is rotated so that the light shielding range by the shade is changed, and the emitted light can be changed between the low beam and the high beam.
  • the shade is positioned by biasing the shade against the fixed stopper by the magnetic force of the electromagnet acting on the magnetic portion of the shade. At this time, the magnetic portion of the shade and the core of the electromagnet are not in contact with each other. It is said to be in contact.
  • the light source unit of the vehicle lamp described in Patent Document 2 below includes a light source, a shade that is rotatably supported by a base plate, a projection lens, and a solenoid actuator having an electromagnet.
  • a part of the light emitted from the light source is blocked by the shade, and the other part of the light enters the projection lens and is emitted from the projection lens.
  • the force from the solenoid actuator is transmitted to the shade through a link member that is rotatably supported by the base plate, and the shade is rotated. By rotating the shade, the light shielding range by the shade is changed, and the light emitted from the projection lens can be changed into a low beam and a high beam.
  • the entire core of the electromagnet in the link member and the solenoid actuator is located between the projection lens and the base plate.
  • a light source unit includes a light source, a shade that includes a magnetic portion including a magnetic body, blocks a part of light emitted from the light source, and is movable in a predetermined direction, and a magnetic body And an electromagnet having a positioning member including: the magnetic part of the shade is brought into contact with the positioning member of the electromagnet by the magnetic force of the electromagnet.
  • the shade that can be moved in a predetermined direction has a magnetic part including a magnetic body. Therefore, when the electromagnet is energized, the magnetic force of the electromagnet is applied to the magnetic part of the shade.
  • the shade can be moved in a predetermined direction by acting. Since this shade blocks a part of the light emitted from the light source, the light shielding range by the shade can be changed by moving the shade. For this reason, the light source unit can change the light distribution pattern.
  • the magnetic force of the electromagnet tends to become weaker when it is separated from a member including the magnetic body of the electromagnet, such as a core or a yoke.
  • the magnetic part of the shade is brought into contact with the positioning member including the magnetic body in the electromagnet by the magnetic force of the electromagnet. For this reason, compared with the case where the magnetic part of the shade does not contact the member including the magnetic body in the electromagnet as in the light source unit described in Patent Document 1, a strong magnetic force acts on the magnetic part of the shade, and the shade is It is possible to position it while holding it more firmly. For this reason, even if it is a case where a light source unit vibrates, it can suppress that the position of the shade with respect to an electromagnet shifts, and can suppress the change of the light distribution pattern which is not intended.
  • the positioning member include an electromagnet core and a yoke.
  • the positioning member may have an elastic body, and the magnetic part may be in contact with the elastic body.
  • the magnetic part may have an elastic body, and the elastic body may be in contact with the positioning member.
  • the magnetic body in the magnetic part may be in contact with the magnetic body in the positioning member.
  • the magnetic flux is diffused between these members.
  • a member that generates magnetic force and a member made of a magnetic material are in direct contact with each other, diffusion of magnetic flux between these members is suppressed, and a stronger magnetic force acts on the member made of a magnetic material.
  • the positioning member since the positioning member includes a magnetic body, a magnetic field is concentrated on the magnetic body in the positioning member, and the magnetic body in the magnetic portion is directly applied to the magnetic body in the positioning member where such magnetic field concentration occurs. Abut.
  • the magnetic part includes a contact part that includes the magnetic body in the magnetic part and is in contact with the positioning member, and a state in which the contact part including the magnetic body in the magnetic part and the positioning member are most separated from each other. It is preferable that the guide portion protrudes toward the positioning member with respect to the contact portion, and the guide portion is not in contact with the positioning member.
  • the contact portion and the positioning portion can be appropriately brought into contact with each other.
  • the guiding portion protrudes closer to the positioning member than the contact portion when the magnetic portion and the positioning member are farthest apart, the leading end portion of the guiding portion including the magnetic body is positioned more than the contact portion including the magnetic body. Located on the member side. For this reason, in such a state, a stronger magnetic force can act on the guide portion than on the contact portion. For this reason, compared with the case where it does not have such a guidance part, stronger magnetic force can be made to act on a magnetic part in the state where a magnetic part and a positioning member were most separated. Therefore, the electromagnet can be reduced in size.
  • the light source unit further includes an urging member, and the shade is rotatable, and the urging member urges the shade in a direction of rotation so that the magnetic portion is separated from the positioning member.
  • the center of gravity of the shade may be positioned on the rotation axis of the shade.
  • the shade is rotated by the magnetic force of the electromagnet resisting the urging force of the urging member, and the magnetic portion is brought into contact with the positioning member. Further, by making the electromagnet in a non-energized state, the shade can be rotated so that the magnetic portion is separated from the positioning member by the urging force of the urging member, and the shade can be held at a predetermined rotation position.
  • the light distribution can be switched by switching between energization and non-energization of the electromagnet.
  • the centroid of the shade is smaller than the case where the center of gravity of the shade is not located on the rotation axis of the shade.
  • the shade can be rotated and the shade can be rotated with a small magnetic force. Therefore, the electromagnet can be reduced in size.
  • the magnetic part and the positioning member may have contact surfaces that contact each other.
  • the shade can be held more stably than in the case of no surface contact.
  • the positioning member When the magnetic part and the positioning member each have a contact surface, the positioning member extends along the extending direction of the coil outside the coil of the electromagnet, and the end of the positioning member on the magnetic part side
  • the part may be bent to the opposite side to the coil side so that the cross-sectional shape is L-shaped, and the surface on the magnetic part side at the end part may be the contact surface.
  • a light source unit includes a base plate, a light source disposed on one side with respect to the base plate, and one of light emitted from the light source supported by the base plate so as to be movable in a predetermined direction.
  • the center of one end is located on the light source side with respect to the base plate.
  • the shade is movable in a predetermined direction and is moved using the magnetic force of the electromagnet. Since this shade blocks a part of the light emitted from the light source, the shading range by the shade can be changed by moving the shade. For this reason, the light source unit can change the light distribution pattern of the light emitted from the projection lens. Further, as described above, the center of one end of the core of the electromagnet is located on the light source side with respect to the projection lens side surface of the base plate.
  • the protrusion amount of the part which protrudes in the projection lens side rather than the base plate in an electromagnet can be made smaller.
  • the projection lens can be brought close to the base plate and can be miniaturized.
  • the light source side focal point of the projection lens approaches the light source.
  • the focal length of the projection lens is shortened, the radius of curvature of at least one of the entrance surface and the exit surface of the projection lens becomes small, so that the outer diameter of the projection lens can be made small. Therefore, the light source unit can be downsized.
  • the electromagnet is arranged so that the extending direction of the core is parallel to the surface direction of the base plate.
  • Electromagnets generally tend to be long in the core extending direction.
  • the electromagnet is disposed such that the extending direction of the core is parallel to the surface direction of the base plate. For this reason, compared with the case where the electromagnet is arrange
  • the light source unit further includes an urging member, and the shade is rotatable and rotated in a predetermined direction using the magnetic force of the electromagnet.
  • the urging member urges the shade in a direction opposite to the direction of rotation using the magnetic force of the electromagnet, and the center of gravity of the shade may be located on the rotation axis of the shade. .
  • the shade when the shade is rotated using the magnetic force of the electromagnet, the shade is rotated in a predetermined direction by the force applied to the shade resisting the urging force of the urging member. It can be held in a pivot position. Moreover, by making the electromagnet in a non-energized state, the shade can be rotated in the direction opposite to the predetermined direction by the urging force of the urging member, and the shade can be held at another predetermined rotation position.
  • the light distribution can be switched by switching between energization and non-energization of the electromagnet.
  • the centroid of the shade is smaller than the case where the center of gravity of the shade is not located on the rotation axis of the shade.
  • the shade can be rotated and the shade can be rotated with a small magnetic force. Therefore, the electromagnet can be reduced in size.
  • the shade may have a magnetic part including a magnetic body.
  • the shade can be moved in a predetermined direction by applying the magnetic force of the electromagnet to the magnetic part including the magnetic body in the shade by energizing the electromagnet. For this reason, the shade can be moved without using a link member that transmits the force generated by the magnetic force of the electromagnet to the shade. For this reason, it can suppress that a number of parts increases compared with the light source unit of the above-mentioned patent documents 2.
  • the light source unit further includes a reflecting member that moves in a predetermined direction according to the movement of the shade between the base plate and the projection lens, and the reflecting member includes: A part of the light emitted from the light source that is different from the light directed toward the base plate side surface of the projection lens may be reflected and incident on the base plate side surface of the projection lens.
  • the reflection member reflects a part of the light emitted from the light source, which is different from the light directed to the surface on the base plate side of the projection lens, and is on the base plate side of the projection lens. Incident on the surface. Further, the reflecting member moves in a predetermined direction in accordance with the movement of the shade. For this reason, by moving the shade, the light shielding range by the shade can be changed, and the amount of light reflected by the reflecting member and incident on the projection lens and the position where this light enters the projection lens can be changed. For this reason, the said light source unit can improve the freedom degree of the light distribution pattern which can be formed compared with the case where a reflection member is not provided.
  • the projection lens and the electromagnet are compared with the case where the entire electromagnet core is located between the projection lens and the base plate. A large space can be formed between the two. For this reason, the said light source unit can enlarge a reflection member, and can improve the utilization efficiency of the light radiate
  • FIG. 1 It is sectional drawing which shows roughly the vehicle lamp in embodiment of this invention. It is the figure which expanded the light source unit of FIG. It is a perspective view of a base plate, a shade, and an electromagnet shown in FIG. It is a perspective view which decomposes
  • FIG. 1 is a cross-sectional view schematically showing a vehicular lamp in the present embodiment, and is a vertical cross-sectional view of the vehicular lamp.
  • the vehicular lamp is the headlamp 1.
  • the headlamps are generally provided in the left and right directions in front of the vehicle, and the left and right headlamps are generally symmetrical in the left and right directions. Therefore, in this embodiment, one headlamp will be described.
  • the headlamp 1 of this embodiment includes a housing 2 and a light source unit 3 as main components.
  • the housing 2 includes a lamp housing 11, a front cover 12, and a back cover 13 as main components.
  • the front of the lamp housing 11 is open, and a colorless and translucent front cover 12 is fixed to the lamp housing 11 so as to close the opening.
  • An opening smaller than the front is formed in the rear of the lamp housing 11, and the back cover 13 is fixed to the lamp housing 11 so as to close the opening.
  • an internal space 14 surrounded by the lamp housing 11, the front cover 12, and the back cover 13 is formed.
  • the light source unit 3 is accommodated in the internal space 14.
  • the light source unit 3 of this embodiment includes a base plate 20, a light source 30, a light emission control circuit 35, a heat sink 40, a reflector 50, a projection lens 60, a shade 70, and an electromagnet 80 as main components.
  • FIG. 2 is an enlarged view of the light source unit of FIG.
  • the base plate 20 is a metal plate-like member extending substantially in the vertical direction, and is fixed to the housing 2 by means (not shown).
  • the base plate 20 is formed with a first opening 21 and a second opening 22 that penetrate the base plate 20.
  • the first opening 21 is located on the optical path through which the light emitted from the light source 30 passes.
  • the second opening 22 is located below the first opening 21.
  • the second opening 22 is connected to the first opening 21, and the first opening 21 and the second opening 22 communicate with each other. .
  • the opening direction of these openings 21 and 22 is the front-rear direction.
  • the light source 30 is a light emitting element that emits light, for example, an LED that emits white light.
  • the light emission of the light source 30 is controlled by the light emission control circuit 35.
  • the heat sink 40 is disposed on the rear side of the base plate 20 and is fixed to the base plate 20 by means (not shown).
  • the heat sink 40 is made of, for example, a metal material, and includes a plate-like base portion 41 that extends substantially in the horizontal direction, and a plate-like rear wall portion 42 that extends substantially perpendicular to the base portion 41 and extends in the left-right direction. .
  • the rear wall portion 42 is positioned on the upper surface side of the base portion 41, the lower end portion of the rear wall portion 42 is connected to the rear end portion of the base portion 41, and the base portion 41 and the rear wall portion 42 are integrally formed. ing.
  • a plurality of heat radiation fins 43 are formed integrally with the base portion 41 on the lower surface side of the base portion 41.
  • a plurality of heat radiation fins 44 are also formed integrally with the rear wall 42 on the rear surface side of the rear wall 42.
  • the light source 30 is placed on an end surface of a pedestal 45 formed on the front side of the rear wall 42 on the upper surface of the base portion 41.
  • the light emission control circuit 35 is disposed below the heat radiating fins 43 and is fixed to the heat sink 40.
  • the reflector 50 is a curved plate-like member, and is fixed to the base portion 41 of the heat sink 40 so as to cover the light source 30 from the upper side in front of the rear wall portion 42 in the heat sink 40.
  • the reflector 50 includes a low beam reflector 51, a high beam reflector 52, and a sub reflector 53.
  • the high beam reflector 52 is disposed closer to the base 41 than the low beam reflector 51.
  • the surface on the light source 30 side in the low beam reflector 51 is a low beam reflecting surface 51R
  • the surface on the light source 30 side in the high beam reflector 52 is a high beam reflecting surface 52R.
  • Each of the low beam reflection surface 51R and the high beam reflection surface 52R is based on a spheroidal curved surface.
  • the position of the first focal point of the elliptic curved surface on the low beam reflecting surface 51R is slightly different from the position of the first focal point of the elliptic curved surface on the high beam reflecting surface 52R.
  • the light source 30 is located in the vicinity of the position of the first focal point of the elliptical curved surface of the low beam reflecting surface 51R and the position of the first focal point of the elliptical curved surface of the high beam reflective surface 52R. A part of the light emitted from the light source 30 is reflected toward the projection lens 60 by the low beam reflecting surface 51R of the low beam reflector 51 and the high beam reflecting surface 52R of the high beam reflector 52.
  • the sub-reflector 53 extends forward from the upper end portion on the front side of the low beam reflector 51, and is located on the opposite side of the base portion 41 side from the low beam reflector 51.
  • the surface on the light source 30 side of the sub reflector 53 is a sub reflection surface 53R, and a part of the light emitted from the light source 30 is reflected to the projection lens 60 side by the sub reflection surface 53R of the sub reflector 53. Light does not enter the projection lens 60 directly.
  • the projection lens 60 is an aspherical biconvex lens, is disposed on the front side of the base plate 20, and is fixed to the base plate 20 via a lens holder 61.
  • the surface on the base plate 20 side is a convex incident surface 62 that swells toward the base plate 20, and the surface opposite to the base plate 20 side is a convex exit surface 63 that swells on the opposite side to the base plate 20 side. Is done.
  • the rear focal point which is the focal point of the projection lens 60 on the light source 30 side, is the position of the first focal point of the elliptical curved surface of the low beam reflecting surface 51R and the position of the first focal point of the elliptical curved surface of the high beam reflecting surface 52R.
  • the projection lens 60 is disposed so as to be located in the vicinity of the. That is, in the light source unit 3 of the present embodiment, a PES (Projector Ellipsoid System) optical system is employed.
  • the projection lens 60 is not limited to an aspherical biconvex lens, and may be an aspherical planoconvex lens in which the incident surface 62 is a flat surface, for example.
  • FIG. 3 is a perspective view of the base plate, shade, and electromagnet shown in FIG. 1
  • FIG. 4 is an exploded perspective view of the base plate, shade, and electromagnet. 1 to 3 show a state in which the electromagnet 80 is in a non-energized state.
  • the boundary between the first opening 21 and the second opening 22 in the base plate 20 is indicated by a broken line. Yes.
  • the shade 70 has a main body 71 and a reflecting portion 72.
  • the main body 71 has a light shielding part 73, a pair of connection parts 74, a magnetic part 75 made of a magnetic material, and a locking part 76.
  • the light shielding portion 73, the pair of connection portions 74, the magnetic portion 75, and the locking portion 76 are integrally formed by bending a plate-like member made of a magnetic material.
  • a magnetic body iron, cobalt, nickel etc. are mentioned, for example.
  • FIG. 5 is a perspective view of the main body of the shade.
  • the light shielding portion 73 extends in the left-right direction, and a protrusion 73 a that protrudes forward along the extending direction of the light shielding portion 73 is formed at the upper end portion.
  • the pair of connection portions 74 are generally symmetrically configured, one connection portion 74 extends forward from one end portion in the left-right direction of the light shielding portion 73, and the other connection portion 74 is the light shielding portion 73. It extends toward the front from the other end in the left-right direction.
  • the pair of connecting portions 74 are formed with through holes 74h penetrating in the left-right direction, and the through holes 74h face each other.
  • a fixing portion 74 a extending toward the other connecting portion 74 is formed in front of the through hole 74 h in the pair of connecting portions 74.
  • a regulating projection 74b that protrudes to the opposite side of the other connecting portion 74 is formed behind and above the through hole 74h in the pair of connecting portions 74, respectively.
  • the magnetic part 75 has a contact part 77 and a pair of guide parts 78.
  • the contact portion 77 extends forward and downward from the lower end portion of the light shielding portion 73.
  • a lower surface of the contact portion 77 is a flat contact surface 77 s along the extending direction of the contact portion 77.
  • One guide portion 78 of the pair of guide portions 78 protrudes downward from one end portion of the contact portion 77 in the left-right direction.
  • the other guide portion 78 protrudes downward from the other end portion of the contact portion 77 in the left-right direction.
  • the magnetic part 75 may not have the guiding part 78.
  • the locking part 76 extends forward from the lower end of the light shielding part 73. Such a magnetic part 75 and the locking part 76 do not overlap with the through hole 74h when viewed from the through direction in the through hole 74h of the connection part 74.
  • the front end of the magnetic part 75 is located behind the fixing part 74 a of the connection part 74 and below the through hole 74 h, and the front end of the locking part 76 is connected to the connection part 74. It is located behind the through hole 74h.
  • the reflecting portion 72 is a plate-like member extending in the left-right direction, one end in the extending direction is fixed to the fixing portion 74a of one connecting portion 74, and the other end is fixed to the other connecting portion 74. It is fixed to the part 74a. For this reason, the part which consists of the light-shielding part 73 in the shade 70, a pair of connection part 74, and the reflection part 72 is formed in frame shape, and the intensity
  • the surface of the reflecting portion 72 opposite to the main body portion 71 is a reflecting surface 72R that reflects light.
  • the reflecting surface 72R is a curved surface that is inclined downward toward the front and curved convexly toward the main body 71 side. For this reason, it can be understood that the reflecting portion 72 is a reflecting member having the reflecting surface 72 ⁇ / b> R and is a part of the shade 70.
  • such a shade 70 can be rotated about the shaft 25 by inserting the columnar shaft 25 into the through holes 74 h of the pair of connection portions 74.
  • the In the present embodiment, the center of gravity of the shade 70 is located on the central axis of the shaft 25. Further, the contact surface 77 s of the contact portion 77 in the magnetic portion 75 is parallel to the extending direction of the shaft 25.
  • the shaft 25 inserted into the through hole 74 h in the shade 70 is fixed to the base plate 20 in this way, so that the shade 70 is rotatably supported by the base plate 20. More specifically, as shown in FIGS. 3 and 4, the base plate 20 is formed with a pair of bearing portions 23 that protrude forward, which is the projection lens 60 side.
  • the pair of bearing portions 23 are juxtaposed in the horizontal direction, and one bearing portion 23 is disposed in the vicinity of the right edge of the first opening 21 of the base plate 20, and the other bearing portion 23 is the left side of the first opening 21. It is arrange
  • the bearing portion 23 is formed by bending a part of the base plate 20, and the vertical cross-sectional shape is substantially L-shaped.
  • the shade 70 is inserted into the first opening 21, and both end portions of the shaft 25 are fixed to the bearing portion 23, so that the shade 70 is rotatably supported by the base plate 20.
  • the shaft 25 fixed to the bearing portion 23 extends in the horizontal direction along the surface direction of the base plate 20, and the shade 70 is connected to the base plate 20. It can be rotated about the direction extending in the horizontal direction along the surface direction. In other words, the shade 70 is rotatable about a direction parallel and horizontal to the surface direction of the base plate 20. Further, as described above, since the center of gravity of the shade 70 is located on the central axis of the shaft 25, it can be understood that the center of gravity of the shade 70 is located on the rotation axis of the shade 70. Note that the center of gravity of the shade 70 may not be located on the rotation axis of the shade 70.
  • the light shielding portion 73 and the regulation protrusion 74 b in the main body portion 71 of the shade 70 are located closer to the light source 30 than the base plate 20, and the reflection portion 72 is the base plate 20. It is located closer to the projection lens 60 side. For this reason, the light shielding part 73 of the shade 70 is located between the light source 30 and the projection lens 60, and the light shielding part 73 blocks a part of the light from the light source 30.
  • Light emitted from the light source 30 is controlled by the light shielding unit 73 and is incident on the incident surface 62 of the projection lens 60, so that light having a light distribution pattern corresponding to the form of the light shielding unit 73 is emitted from the emission surface 63 of the projection lens 60. Is done.
  • the light emitted from the emission surface 63 of the projection lens 60 passes through the front cover 12 and is emitted toward the front of the vehicle outside the vehicle.
  • a pair of pressing portions 24 that protrude toward the light source 30 side along the pair of connection portions 74 in the main body portion 71 are formed at the edge portion of the first opening 21 of the base plate 20. Yes. For this reason, the movement in the axial direction of the shaft 25 with respect to the base plate 20 of the shade 70 is restricted.
  • the presser portion 24 is formed by bending a part of the base plate 20.
  • a torsion spring 26 is interposed between the base plate 20 and the shade 70. Specifically, the torsion spring 26 into which the shaft 25 is inserted is disposed between the pair of connection portions 74. One end of the torsion spring 26 abuts on the locking portion 76 from below and is locked to the locking portion 76, and the other end of the torsion spring 26 is near the edge of the first opening 21 of the base plate 20. Abutting from the light source 30 side, the base plate 20 is engaged. The elastic force of the torsion spring 26 acts on the shade 70 so as to rotate the shade 70 counterclockwise around the shaft 25 in FIG.
  • the regulation protrusions 74b formed on the pair of connection parts 74 are pressed from the light source 30 side in the vicinity of the edge of the first opening 21 of the base plate 20, respectively, and the shade 70 does not rotate around the shaft 25. So that it is held. Therefore, the torsion spring 26 is an urging member that urges the shade 70 in a direction in which the shade 70 rotates counterclockwise about the shaft 25 in FIG. It can be understood that it is an urging force that urges such a force.
  • the electromagnet 80 has a core 81 made of a magnetic material, a coil 82 made of a winding wound around the core 81, and a yoke 83 made of a magnetic material.
  • a magnetic body in the core 81 and the yoke 83 iron, cobalt, nickel etc. are mentioned, for example, Each magnetic body may be made into the same magnetic body mutually, and may be made into a different magnetic body.
  • the core 81 has a columnar shape extending linearly, and both end portions of the core 81 protrude from the end portions of the coils 82, respectively.
  • the diameter of the portion of the core 81 located inside the coil 82 is approximately the same diameter. Further, the diameter at one end 81a is smaller than the diameter of the portion located inside the coil 82, and the diameter at the other end 81b is larger than the diameter of the portion located inside the coil 82.
  • the coil 82 is composed of the winding wound around the cylindrical core 81 as described above, the coil 82 extends along the extending direction of the core 81.
  • the yoke 83 has a pair of plate-like side wall portions 84 and a plate-like bottom wall portion 85.
  • the pair of side wall portions 84 extend outside the coil 82 along the extending direction of the coil 82 and face each other.
  • a through hole is formed at the center of the bottom wall portion 85, and one end 81a of the core 81 is inserted into the through hole.
  • end portions on the one end portion 81 a side of the core 81 in the pair of side wall portions 84 are respectively connected.
  • the end surfaces of the pair of side wall portions 84 on the other end portion 81b side of the core 81 are located on the opposite side of the other end portion 81b of the core 81 from the bottom wall portion 85 side, and the respective end surfaces are coiled.
  • the flat contact surface 84 s is located on the same plane perpendicular to the extending direction of 82.
  • the width between the pair of side wall portions 84 is set to be smaller than the width between the pair of guide portions 78 in the shade 70.
  • the electromagnet 80 generates a magnetic force when a current is passed through the coil 82, and the magnetic body is attracted to the end of the core 81 where the magnetic field is concentrated or the end of the pair of side walls 84 of the yoke 83.
  • the electromagnet 80 does not generate a magnetic force.
  • the central axis CA of the core 81 extends in a direction perpendicular to the surface direction of the base plate 20 on the light source 30 side of the base plate 20. It arrange
  • the pair of side wall portions 84 of the yoke 83 extend in the front-rear and vertical directions, and the contact surfaces 84 s of the pair of side wall portions 84 of the electromagnet 80 are located closest to the contact portion 77 of the shade 70. Yes. Further, the contact surfaces 84 s of the pair of side wall portions 84 are parallel to the extending direction of the shaft 25. Further, the contact surfaces 84 s of the pair of side wall portions 84 in the yoke 83 are located in a space through which the contact portion 77 passes when the shade 70 rotates about the shaft 25, and the contact surfaces of the side wall portions 84. The normal extending from 84 s intersects the contact surface 77 s of the contact portion 77.
  • the core 81 is not arranged on the projection lens 60 side from the base plate 20. ing.
  • the electromagnet 80 is fixed to the base plate 20 by means (not shown).
  • FIG. 6 is an enlarged view of a part of FIG. 2, and is an enlarged view of the vicinity of the shade 70 and the electromagnet 80.
  • the angle formed by 84s is a line segment connecting the shaft 25 and the circle C passing through the arbitrary point P1 on the contact surface 84s with the shaft 25 as the center and the intersection P2 of the contact surface 77s in the magnetic part 75.
  • the angle between LS2 and the contact surface 77s is substantially the same.
  • the pair of guide portions 78 protrudes downward from the end portion of the contact portion 77 in the left-right direction, and the electromagnet 80 is disposed below the contact portion 77 of the shade 70.
  • the contact surfaces 84 s of the pair of side wall portions 84 of the yoke 83 are located closest to the contact portion 77 of the shade 70. For this reason, in the state shown in FIG. 2, it can be understood that the pair of guide portions 78 protrudes toward the yoke 83 of the electromagnet 80 from the contact portion 77.
  • FIG. 7 is a diagram illustrating a state where the electromagnet is in a non-energized state, and is a diagram schematically illustrating an example of an optical path of light emitted from the light source.
  • descriptions of the light emission control circuit 35 and the heat radiation fins 43 and 44 in the heat sink 40 are omitted.
  • the angle of each reflecting surface, the light reflection angle, the refraction angle, and the like may not be accurate.
  • the headlamps are provided symmetrically on the left and right sides of the vehicle. In the following description of the light distribution, the light distribution when the headlights provided on the left and right are similarly turned on or off will be described.
  • the restricting projection 74 b of the connecting portion 74 in the shade 70 is pressed against the base plate 20 from the light source 30 side by the biasing force of the torsion spring 26 that is a biasing member.
  • the shade 70 is held so as not to rotate about the shaft 25. That is, the shade 70 is positioned at a predetermined position by the urging force of the torsion spring 26 that is an urging member.
  • the white light from the light source 30 is reflected mainly by the low-beam reflecting surface 51R of the low-beam reflector 51, the high-beam reflecting surface 52R of the high-beam reflector 52, and the sub-reflecting surface 53R of the sub-reflector 53. Is done. A part of the light reflected by the low beam reflecting surface 51R and the high beam reflecting surface 52R is shielded by the light shielding portion 73 of the shade 70, and the other part of the light passes through the first opening 21 of the base plate 20. Then, the light enters the incident surface 62 of the projection lens 60 and exits from the exit surface 63.
  • the light reflected by the sub-reflecting surface 53R mainly passes through the first opening 21 of the base plate 20, most of the light crosses the projection lens 60 side from the reflection lens 72 of the shade 70 downward from above to the projection lens 60. Is not incident.
  • the light emitted from the emission surface 63 of the projection lens 60 is transmitted through the front cover 12 and emitted toward the front of the vehicle.
  • the light-shielding unit 73 of the present embodiment has a light distribution pattern from the light source 30 so that the light distribution pattern of the light emitted from the emission surface 63 of the projection lens 60 becomes a low beam distribution pattern. Block out some of the light. For this reason, a low beam is emitted from the headlamp 1.
  • FIG. 8 is a diagram showing a state where the electromagnet is energized, and is a diagram schematically showing an example of an optical path of light emitted from the light source.
  • the electromagnet 80 when the electromagnet 80 is energized, as described above, the electromagnet 80 generates a magnetic force, and the magnetic body has an end portion of the core 81 and a pair of side walls of the yoke 83 where the magnetic field is concentrated. It is attracted to the end of the portion 84.
  • the shade 70 is formed from a plate-like member made of a magnetic material.
  • the electromagnet 80 is disposed below the contact portion 77 of the shade 70, and the contact surfaces 84 s of the pair of side wall portions 84 of the electromagnet 80 are the shade 70. It is located closest to the contact portion 77. Therefore, a magnetic force acts on the shade 70 so that the shade 70 is attracted to the side where the both end portions 81b of the core 81 in the electromagnet 80 and the contact surfaces 84s of the pair of side wall portions 84 are located.
  • the magnetic force of the electromagnet 80 acting on the shade 70 resists the biasing force of the torsion spring 26, the abutment portion 77 of the shade 70 approaches the abutment surface 84 s of the pair of side wall portions 84 about the shaft 25.
  • the contact surfaces 84 s of the pair of side wall portions 84 in the yoke 83 are located in a space through which the contact portions 77 pass when the shade 70 rotates about the shaft 25. For this reason, as shown in FIG. 8, the abutting portion 77 of the magnetic portion 75 abuts against the abutting surfaces 84 s of the pair of side wall portions 84 of the yoke 83, and the shade 70 rotates around the shaft 25 by the magnetic force of the electromagnet 80. It is held so as not to move. That is, the shade 70 is positioned at another predetermined position by the magnetic force of the electromagnet 80.
  • the yoke 83 can be understood to be a positioning member with which the contact portion 77 of the magnetic portion 75 contacts when the shade 70 is positioned.
  • the width between the pair of side wall portions 84 is smaller than the width between the pair of guide portions 78 in the shade 70, and the guide portion 78 of the magnetic portion 75 of the shade 70 does not contact the yoke 83.
  • the contact portion 77 contacts the contact surfaces 84 s of the pair of side wall portions 84.
  • the line segment LS1 connecting the shaft 25 and an arbitrary point P1 on the contact surface 84s of the pair of side wall portions 84 in the yoke 83 The angle formed by the contact surface 84s is an intersection point P2 between the shaft 25 and the circle C passing through the arbitrary point P1 on the contact surface 84s with the shaft 25 as a center and the contact surface 77s of the magnetic portion 75.
  • the angle between the connecting line segment LS2 and the contact surface 77s is substantially the same.
  • the contact surface 77s of the contact portion 77 and the contact surfaces 84s of the pair of side wall portions 84 are in surface contact with each other. That is, it can be understood that the magnetic part 75 and the yoke 83 have contact surfaces 77s and 84s that contact each other.
  • the light from the light source 30 is mainly reflected by the low-beam reflecting surface 51 ⁇ / b> R of the low-beam reflector 51 and the high-beam reflecting of the high-beam reflector 52 in the same manner as when the low beam is emitted from the headlamp 1.
  • a part of the light reflected by the low beam reflecting surface 51R and the high beam reflecting surface 52R is shielded by the light shielding portion 73 of the shade 70, and the other part of the light passes through the first opening 21 of the base plate 20. Then, the light enters the incident surface 62 of the projection lens 60 and exits from the exit surface 63.
  • the light shielding portion 73 moves downward from the state shown in FIG. 7 and is tilted backward. For this reason, the position of the light shielding portion 73 with respect to the low beam reflecting surface 51R and the high beam reflecting surface 52R is changed, and the light shielding range by the light shielding portion 73 is changed. Since the reflecting portion 72 is a part of the shade 70, the reflecting portion 72 rotates in a predetermined direction between the base plate 20 and the projection lens 60 when the shade 70 rotates. Then, the reflection surface 72R of the reflection portion 72 of the shade 70 is inclined so as to approach the horizontal from the state shown in FIG. 7, the front end is positioned more forward, and the reflection surface 72R is a sub-reflection surface 53R.
  • the reflecting unit 72 reflects a part of the light emitted from the light source 30 that is different from the light directed to the incident surface 62 of the projection lens 60 and causes the light to enter the incident surface 62 of the projection lens 60.
  • the light shielding range by the light shielding unit 73 is changed and the light reflected by the reflecting surface 72R is emitted from the emission surface 63 of the projection lens 60.
  • the light distribution of the light emitted from the emission surface 63 of the projection lens 60 is distributed.
  • the pattern is different from the low beam distribution pattern.
  • the light shielding unit 73 is provided from the light source 30 so that the light distribution pattern of light emitted from the emission surface 63 of the projection lens 60 becomes a high beam light distribution pattern in a state where the shade 70 is held in this manner. A part of the light is blocked, and the reflecting surface 72R reflects the light reflected by the sub-reflecting surface 53R.
  • the shade 70 is positioned at the predetermined position shown in FIG. 7 by the urging force of the torsion spring 26 that is an urging member. . That is, in the headlamp 1 of the present embodiment, the light distribution can be switched by switching between energization and non-energization of the electromagnet 80. Further, since the shade 70 rotates between a position when the coil 82 shown in FIG. 7 is in a non-energized state and a position where the coil 82 shown in FIG. 8 is in an energized state, the coil 82 shown in FIG.
  • the state that is a state is a state in which the contact portion 77 and the yoke 83 are farthest apart.
  • the torsion spring 26 urges the shade 70 in a direction in which the magnetic part 75 rotates so as to be separated from the yoke 83. In other words, the torsion spring 26 urges the shade 70 in a direction opposite to the direction in which the torsion spring 26 is rotated using the magnetic force of the electromagnet 80.
  • the light source unit when used for, for example, a vehicle lamp, the light source unit vibrates due to the vibration of the vehicle.
  • the shade is positioned by a magnetic force as in the light source unit of Patent Document 1
  • the position of the shade is displaced, and the light distribution pattern may change unintentionally. For this reason, even when the light source unit vibrates, there is a demand for suppressing unintentional changes in the light distribution pattern.
  • the light source unit 3 of the present embodiment as the first mode includes the light source 30 and the magnetic part 75 made of a magnetic material, and blocks a part of the light emitted from the light source 30 and can move in a predetermined direction.
  • the magnetic part 75 of the shade 70 is brought into contact with the yoke 83 of the electromagnet 80 by the magnetic force of the electromagnet 80.
  • the shade 70 that can be moved in the predetermined direction has the magnetic portion 75 made of a magnetic material, so that the electromagnet is energized.
  • the shade 70 can be moved in a predetermined direction by applying the magnetic force of the electromagnet to the magnetic portion 75 of the shade 70. Since the shade 70 blocks a part of the light emitted from the light source 30, the light shielding range by the shade 70 can be changed by moving the shade 70. For this reason, a light distribution pattern can be changed.
  • the magnetic force of the electromagnet tends to become weaker when it is separated from a member including the magnetic body of the electromagnet, such as a core or a yoke.
  • the magnetic part 75 of the shade 70 is brought into contact with the yoke 83 including the magnetic body in the electromagnet 80 by the magnetic force of the electromagnet 80.
  • the magnetic part 75 of the shade 70 has a stronger magnetic force. It acts and can hold and position shade 70 more firmly. For this reason, even if it is a case where the light source unit 3 vibrates, it can suppress that the position of the shade 70 with respect to the electromagnet 80 shifts
  • the magnetic part 75 made of a magnetic body of the shade 70 is brought into contact with a yoke 83 made of a magnetic body. That is, the magnetic body in the magnetic part 75 is brought into contact with the magnetic body in the yoke 83.
  • a member that generates a magnetic force is separated from a member made of a magnetic material, or a non-magnetic material is interposed between these members, the magnetic flux is diffused between these members.
  • a member that generates magnetic force and a member made of a magnetic material are in direct contact with each other, diffusion of magnetic flux between these members is suppressed, and a stronger magnetic force acts on the member made of a magnetic material.
  • the yoke 83 is made of a magnetic material, the magnetic field is concentrated on the yoke 83, and the yoke 83 where such magnetic field concentration is generated is made of magnetic material.
  • the magnetic part 75 is directly abutted. For this reason, compared with the case where the yoke 83 made of a magnetic material and the magnetic part 75 made of a magnetic material are not in direct contact with each other, a strong magnetic force can be applied to the magnetic portion 75 of the shade 70, thereby making the shade 70 stronger. Can be held and positioned.
  • the magnetic part 75 includes a contact part 77 and a pair of guide parts 78.
  • the contact portion 77 is made of a magnetic material and is in contact with a pair of side wall portions 84 in the yoke 83.
  • the pair of guide portions 78 is made of a magnetic material and protrudes closer to the yoke 83 than the contact portion 77 when the contact portion 77 and the yoke 83 are farthest apart from each other, and is not in contact with the yoke 83. Since the pair of guide portions 78 are not in contact with the yoke 83, the contact portion 77 and the yoke 83 can be brought into contact with each other appropriately.
  • the pair of guide portions 78 protrudes closer to the yoke 83 than the contact portion 77. Therefore, the distal ends of the pair of guide portions 78 made of a magnetic material are magnetic. It is located on the yoke 83 side with respect to the contact portion 77 made of a body. For this reason, in such a state, a stronger magnetic force can act on the pair of guide portions 78 than on the contact portions 77. Therefore, a stronger magnetic force can be applied to the magnetic part 75 in a state where the magnetic part 75 and the yoke 83 are farthest apart compared to the case where the guide part 78 is not provided. Therefore, the electromagnet 80 can be reduced in size.
  • the light source unit 3 includes a torsion spring 26 that is an urging member.
  • the shade 70 is rotatable, and the torsion spring 26 urges the shade 70 in a direction in which the magnetic part 75 is rotated so as to be separated from the yoke 83.
  • the center of gravity of the shade 70 is located on the rotation axis of the shade 70.
  • the shade 70 is rotated by the magnetic force of the electromagnet 80 resisting the biasing force of the torsion spring 26, and the magnetic part 75 is brought into contact with the yoke 83.
  • the shade 70 is rotated so that the magnetic portion 75 is separated from the yoke 83 by the urging force of the torsion spring 26, and the shade 70 can be held at a predetermined rotation position.
  • the light distribution can be switched by switching between energization and non-energization of the electromagnet 80.
  • the center of gravity of the shade 70 is located on the rotation axis of the shade 70, compared to the case where the center of gravity of the shade 70 is not located on the rotation axis of the shade 70, The shade 70 can be rotated with a small biasing force, and the shade 70 can be rotated with a small magnetic force. Therefore, the electromagnet 80 can be reduced in size.
  • the magnetic part 75 and the yoke 83 have contact surfaces 77s and 84s that contact each other. For this reason, since the magnetic part 75 and the yoke 83 are in surface contact, the shade 70 can be held more stably than in the case of no surface contact.
  • the light source unit 3 of the present embodiment as the second aspect includes a base plate 20, a light source 30, a shade 70, a projection lens 60, and an electromagnet 80.
  • the light source 30 is disposed on one side with respect to the base plate 20.
  • the shade 70 is supported by the base plate 20 so as to be movable in a predetermined direction, and blocks a part of the light emitted from the light source 30.
  • the projection lens 60 is disposed on the opposite side of the light source 30 from the base plate 20.
  • the shade 70 is moved using the magnetic force of the electromagnet 80, and the centers 81ac and 81bc at both ends of the core 81 of the electromagnet 80 are located closer to the light source 30 than the base plate 20.
  • the shade 70 is movable in a predetermined direction as described above, and is moved using the magnetic force of the electromagnet 80. Since the shade 70 blocks part of the light emitted from the light source 30, the light shielding range by the shade 70 can be changed by moving the shade 70. For this reason, the light source unit 3 of the present embodiment as the second aspect can change the light distribution pattern of the light emitted from the projection lens 60. Further, as described above, the centers 81ac and 81bc at both ends of the core 81 of the electromagnet 80 are located closer to the light source 30 than the surface of the base plate 20 on the projection lens 60 side.
  • the projection lens 60 side of the electromagnet 80 is closer to the projection lens 60.
  • the amount of protrusion of the portion protruding to can be reduced.
  • the projection lens 60 can be brought close to the base plate 20 and can be miniaturized. Further, by bringing the projection lens 60 closer to the base plate 20, the rear focal point of the projection lens 60 approaches the light source 30.
  • the focal length of the projection lens 60 needs to be shortened so that the position of the rear focal point of the projection lens 60 relative to the light source 30 does not approach the light source 30.
  • the focal length of the projection lens 60 is shortened, the radius of curvature of at least one of the entrance surface 62 and the exit surface 63 of the projection lens 60 becomes small, so the outer diameter of the projection lens 60 can be made small. Therefore, the light source unit 3 can be reduced in size.
  • the electromagnet 80 is arranged so that the extending direction of the core 81 is parallel to the surface direction of the base plate 20. Electromagnets generally tend to be elongated in the direction in which the core extends.
  • the electromagnet 80 is disposed so that the extending direction of the core 81 is parallel to the surface direction of the base plate 20. For this reason, compared with the case where the electromagnet 80 is arranged so that the extending direction of the core 81 is inclined with respect to the surface direction of the base plate 20, the protrusion of the portion of the electromagnet 80 that protrudes closer to the projection lens 60 than the base plate 20. The amount can be reduced. For this reason, the projection lens 60 can be brought closer to the base plate 20.
  • the light source unit 3 includes a torsion spring 26 that is an urging member.
  • the shade 70 is rotatable and is rotated in a predetermined direction using the magnetic force of the electromagnet 80.
  • the torsion spring 26 urges the shade 70 in the direction opposite to the direction in which the torsion spring 26 is rotated using the magnetic force of the electromagnet 80.
  • the center of gravity of the shade 70 is located on the rotation axis of the shade 70.
  • the force applied to the shade 70 when the shade 70 is rotated using the magnetic force of the electromagnet 80 resists the biasing force of the torsion spring 26 so that the shade 70 is predetermined.
  • the shade 70 can be held in a predetermined rotational position. Further, by making the electromagnet 80 in a non-energized state, the shade 70 can be rotated in the direction opposite to the predetermined direction by the urging force of the torsion spring 26, and the shade 70 can be held at another predetermined rotation position. As described above, in the light source unit 3 of the present embodiment as the second mode, the light distribution can be switched by switching between energization and non-energization of the electromagnet 80.
  • the center of gravity of the shade 70 is located on the rotation axis of the shade 70, compared to the case where the center of gravity of the shade 70 is not located on the rotation axis of the shade 70, The shade 70 can be rotated with a small biasing force, and the shade 70 can be rotated with a small magnetic force. Therefore, the electromagnet 80 can be reduced in size.
  • the shade 70 has a magnetic part 75 made of a magnetic material.
  • the magnetic force of the electromagnet 80 is applied to the magnetic part 75 made of a magnetic material in the shade 70 by energizing the electromagnet 80 to move the shade 70 in a predetermined direction. Can be moved. For this reason, the shade 70 can be moved without using a link member that transmits the force generated by the magnetic force of the electromagnet 80 to the shade 70. For this reason, it can suppress that a number of parts increases compared with the light source unit of the above-mentioned patent documents 2.
  • the shade 70 has a reflecting portion 72 that moves in a predetermined direction between the base plate 20 and the projection lens 60.
  • the reflection unit 72 reflects a part of the light emitted from the light source 30 that is different from the light directed to the incident surface 62 of the projection lens 60 and causes the light to enter the incident surface 62 of the projection lens 60.
  • the reflecting unit 72 is a part of light that is different from the light emitted from the light source 30 toward the incident surface 62 of the projection lens 60. Is reflected and made incident on the incident surface 62 of the projection lens 60.
  • the reflecting portion 72 is a part of the shade 70 and moves in a predetermined direction.
  • the light source unit 3 of the present embodiment as the second aspect can improve the degree of freedom of the light distribution pattern that can be formed, as compared with the case where the shade 70 does not have the reflecting portion 72. Further, as described above, since the centers 81ac and 81bc at both ends of the core 81 of the electromagnet 80 are located closer to the light source 30 than the base plate 20, the entire core 81 of the electromagnet 80 is located between the projection lens 60 and the base plate 20.
  • the light source unit 3 of the present embodiment as the second aspect can enlarge the reflecting portion 72 and can improve the utilization efficiency of the light emitted from the light source 30.
  • the shade 70 has the magnetic part 75 made of a magnetic material.
  • the electromagnet 80 includes a yoke 83 that is a positioning member made of a magnetic material.
  • the magnetic force of the electromagnet tends to become weaker when it is separated from a member including the magnetic body of the electromagnet, such as a core or a yoke.
  • the magnetic part 75 of the shade 70 is brought into contact with the yoke 83 including the magnetic body in the electromagnet 80 by the magnetic force of the electromagnet 80.
  • the magnetic part 75 made of a magnetic material of the shade 70 is brought into contact with the yoke 83 made of a magnetic material. That is, the magnetic body in the magnetic part 75 is brought into contact with the magnetic body in the yoke 83.
  • the magnetic flux is diffused between these members.
  • a member that generates magnetic force and a member made of a magnetic material are in direct contact with each other, diffusion of magnetic flux between these members is suppressed, and a stronger magnetic force acts on the member made of a magnetic material.
  • the yoke 83 is made of a magnetic material, the magnetic field is concentrated on the yoke 83, and the yoke 83 where such magnetic field concentration is generated is made of the magnetic material.
  • the magnetic part 75 is directly abutted. For this reason, compared with the case where the yoke 83 made of a magnetic material and the magnetic part 75 made of a magnetic material are not in direct contact with each other, a strong magnetic force can be applied to the magnetic portion 75 of the shade 70, thereby making the shade 70 stronger. Can be held and positioned.
  • the magnetic part 75 includes a contact part 77 and a pair of guide parts 78.
  • the contact portion 77 is made of a magnetic material and is in contact with a pair of side wall portions 84 in the yoke 83.
  • the pair of guide portions 78 is made of a magnetic material and protrudes closer to the yoke 83 than the contact portion 77 when the contact portion 77 and the yoke 83 are farthest apart from each other, and is not in contact with the yoke 83. Since the pair of guide portions 78 are not in contact with the yoke 83, the contact portion 77 and the yoke 83 can be brought into contact with each other appropriately.
  • the pair of guide portions 78 protrudes closer to the yoke 83 than the contact portion 77. Therefore, the distal ends of the pair of guide portions 78 made of a magnetic material are magnetic. It is located on the yoke 83 side with respect to the contact portion 77 made of a body. For this reason, in such a state, a stronger magnetic force can act on the pair of guide portions 78 than on the contact portions 77. Therefore, a stronger magnetic force can be applied to the magnetic part 75 in a state where the magnetic part 75 and the yoke 83 are farthest apart compared to the case where the guide part 78 is not provided. Therefore, the electromagnet 80 can be reduced in size.
  • the magnetic part 75 and the yoke 83 have contact surfaces 77s and 84s that contact each other. For this reason, since the magnetic part 75 and the yoke 83 are in surface contact, the shade 70 can be held more stably than in the case of no surface contact.
  • the electromagnet 80 in which the centers 81ac and 81bc at both ends of the core 81 are located closer to the light source 30 than the base plate 20 has been described as an example.
  • the electromagnet 80 is disposed at a position rotated by a predetermined angle around the shaft 25 from the position in the above embodiment, and the center of the end on the end portion 81 a side of the core 81 is closer to the light source 30 side than the base plate 20. It may be located on the opposite side.
  • the centers 81ac and 81bc at both ends of the core 81 are preferably located closer to the light source 30 than the base plate 20, and the core 81 is not disposed closer to the projection lens 60 than the base plate 20. preferable.
  • FIG. 9 is a view showing a modification of the shade in the same manner as FIG.
  • the same referential mark is attached
  • the shade 70 shown in FIG. 9 is different from the shade 70 in the light source unit 3 of the above embodiment in that the magnetic part 75 has an elastic layer made of an elastic body.
  • the magnetic part 75 in the shade 70 of this modification has an elastic body layer 90 made of an elastic body on the electromagnet 80 side of the contact part 77 made of a magnetic body, and the elastic body layer 90 is exposed to the outside.
  • Examples of the elastic body include silicon rubber and a composite material in which a magnetic body is dispersed in a resin.
  • the elastic body layer 90 in the magnetic part 75 comes into contact with the contact surfaces 84 s of the pair of side wall parts 84 in the yoke 83, and the shade 70 is held so as not to rotate about the shaft 25 by the magnetic force of the electromagnet 80. That is, when the shade 70 is positioned by the magnetic force of the electromagnet 80, the elastic body of the magnetic part 75 is brought into contact with the yoke 83 that is a positioning member. For this reason, the sound produced when the magnetic part 75 and the yoke 83 contact
  • the yoke 83 may have an elastic layer made of an elastic body in place of the magnetic portion 75 from the viewpoint of suppressing sound generated when the magnetic portion 75 and the yoke 83 serving as a positioning member come into contact with each other.
  • FIG. 10 is a view showing a modification of the electromagnet in the same manner as FIG.
  • the same referential mark is attached
  • the electromagnet 80 shown in FIG. 10 differs from the electromagnet 80 in the light source unit 3 of the above embodiment in that the pair of side wall portions 84 of the yoke 83 has an elastic layer made of an elastic body.
  • the pair of side wall portions 84 of the yoke 83 in the electromagnet 80 of the present modified example has an elastic body layer 190 made of an elastic body at the end of the shade 70 on the contact portion 77 side, and the elastic body layer 190 is exposed to the outside. Exposed.
  • the elastic body include silicon rubber and a composite material in which a magnetic body is dispersed in a resin.
  • the magnetic part 75 may have an elastic layer made of an elastic body, and the elastic body of the magnetic part 75 may be in contact with the elastic body of the yoke 83.
  • the magnetic part 75 and the yoke 83 as the positioning member have contact surfaces 77 s and 84 s that are in contact with each other, and the magnetic part 75 and the yoke 83 are caused by the magnetic force of the electromagnet 80. There was surface contact. However, there is no particular limitation as long as the magnetic part 75 contacts the yoke 83 that is a positioning member by the magnetic force of the electromagnet 80. However, from the viewpoint of stably holding the shade 70, it is preferable that the magnetic portion 75 and the yoke 83 are in surface contact by the magnetic force of the electromagnet 80.
  • one end surface of the pair of side wall portions 84 of the yoke 83 is the contact surface 84s with which the magnetic portion 75 contacts.
  • the contact surface with which the magnetic part 75 contacts is not particularly limited.
  • FIG. 11 is a perspective view showing another modification of the electromagnet.
  • the electromagnet 80 shown in FIG. 11 differs from the electromagnet 80 in the above embodiment in that the ends of the pair of side walls 84 of the yoke 83 on the magnetic part 75 side are bent.
  • the end portions on the magnetic portion 75 side of the pair of side wall portions 84 in the yoke 83 are bent to the side opposite to the coil 82 side so that the cross-sectional shape is L-shaped.
  • a surface on the side of the magnetic part 75 at the bent end portion is a contact surface 184s, and the contact surface 184s extends so as to cross a part of the magnetic flux line of the magnetic field generated by the coil 82 in a substantially vertical direction.
  • the contact surface 184s is located in a space through which the contact portion 77 of the magnetic portion 75 passes when the shade 70 rotates about the shaft 25, and the electromagnet 80.
  • the contact portion 77 is in contact with the contact surface 184s by the magnetic force of.
  • the shade 70 can be stably rotated by the magnetic force of the electromagnet 80 without increasing the size of the coil 82 of the electromagnet 80.
  • the core 81 and the yoke 83 are only required to concentrate the magnetic field.
  • the yoke 83 may not have the bottom wall portion 85.
  • the magnetic part 75 is in contact with the yoke 83 that is a positioning member by the magnetic force of the electromagnet 80.
  • the positioning member may be a member including a magnetic body and is not limited to the yoke 83.
  • the core 81 of the electromagnet 80 may be used as a positioning member, and the magnetic part 75 may come into contact with the core 81 by the magnetic force of the electromagnet 80.
  • the electromagnet 80 has the center axis CA of the core 81 extending in the vertical direction parallel to the surface direction of the base plate 20 on the light source 30 side of the base plate 20. It was arrange
  • the arrangement of the electromagnet 80 is not particularly limited.
  • the electromagnet 80 may be arranged at a position rotated by a predetermined angle around the shaft 25 from the position in the above embodiment.
  • the reflecting portion 72 is a part of the shade 70, and the reflecting portion 72 moves in a predetermined direction between the base plate 20 and the projection lens 60.
  • a part of the light emitted from the light source 30 by the reflecting unit 72 is different from the light directed to the incident surface 62 of the projection lens 60 and is incident on the incident surface 62 of the projection lens 60.
  • the light source unit includes a reflecting member that moves in a predetermined direction according to the movement of the shade 70 between the base plate 20 and the projection lens 60, and the projection lens 60 out of the light emitted from the light source 30 by the reflecting member.
  • a part of the light different from the light traveling toward the incident surface 62 may be reflected and incident on the incident surface 62 of the projection lens 60.
  • the shade 70 and the reflecting portion 72 may be separated. Even if it is set as such a structure, the freedom degree of the light distribution pattern which can be formed can be improved compared with the case where a reflection member is not provided.
  • the light source unit may not include such a reflecting member, and the shade 70 may not include the reflecting portion 72.
  • the light source unit 3 that can switch between the low beam distribution and the high beam distribution has been described as an example.
  • the light source unit 3 only needs to change the light distribution pattern, and the light distribution pattern is not particularly limited.
  • the light source unit 3 may be a light source unit in a lamp different from the vehicle headlamp.
  • the shade 70 having the reflecting portion 72 and rotatably supported by the base plate 20 has been described as an example.
  • the shade 70 is not particularly limited as long as it has a magnetic part 75 including a magnetic body, blocks a part of light emitted from the light source, and can move in a predetermined direction.
  • the shade may not have the reflecting portion 72 and may be movable along the surface direction of the base plate 20. Even in such a configuration, when the shade moves along the surface direction of the base plate 20, the light shielding range by the shade is changed, and the light distribution pattern can be changed.
  • the shade 70 is supported by the base plate 20 so as to be movable in a predetermined direction, blocks a part of the light emitted from the light source 30, and is moved using the magnetic force of the electromagnet 80. If it does not specifically limit.
  • the shade may be movable along the surface direction of the base plate 20. Even in such a configuration, when the shade moves along the surface direction of the base plate 20, the light shielding range by the shade is changed, and the light distribution pattern can be changed.
  • the electromagnet 80 may be a part of the solenoid actuator, and the force from the solenoid actuator may be transmitted to the shade 70 via a transmission member such as a link member, and the shade 70 may be moved.
  • the shade 70 may not have the magnetic part 75 including a magnetic body.
  • the second opening 22 of the base plate 20 is connected to the first opening 21, and the first opening 21 and the second opening 22 communicate with each other.
  • the first opening 21 and the second opening 22 do not have to communicate with each other.
  • the shade 70 is urged by the urging force of the torsion spring 26 that is an urging member.
  • the biasing member is not particularly limited in the light source unit of the first aspect as long as it biases the shade 70 in a direction in which the magnetic part 75 rotates so as to be separated from the yoke 83 that is the positioning member.
  • the urging member is not particularly limited as long as the urging member urges the shade 70 in the direction opposite to the rotating direction using the magnetic force of the electromagnet 80.
  • the urging member may be a spring.
  • the PES optical system is applied.
  • a parabolic optical system may be applied, and the direct optical that directly enters the light from the light source into the lens without using a reflector.
  • a system may be applied.
  • a light source unit that can suppress unintended changes in the light distribution pattern is provided.
  • a light source unit that can be reduced in size is provided. Provided and available in fields such as lighting.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Optics & Photonics (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Abstract

La présente invention concerne une unité de source de lumière (3) comprenant : une source de lumière (30) ; un abat-jour (70) qui a une partie magnétique (75) comprenant un corps magnétique, bloque une partie de la lumière émise par la source de lumière (30), et peut être déplacé dans une direction prédéterminée ; et un électro-aimant (80) qui a une culasse (83) servant d'élément de positionnement comprenant un corps magnétique. La partie magnétique (75) de l'abat-jour (70) est mise en contact avec la culasse (83) de l'électroaimant (80) par la force magnétique de l'électro-aimant (80).
PCT/JP2019/020937 2018-05-31 2019-05-27 Unité de source de lumière WO2019230663A1 (fr)

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JP2018-105065 2018-05-31
JP2018105066 2018-05-31
JP2018-105066 2018-05-31
JP2018105065 2018-05-31

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WO2019230663A1 true WO2019230663A1 (fr) 2019-12-05

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0290503A (ja) * 1988-09-27 1990-03-30 Matsushita Electric Works Ltd 有極電磁石
JPH02170508A (ja) * 1988-12-23 1990-07-02 Matsushita Electric Works Ltd 有極電磁石装置
JPH0833303A (ja) * 1994-07-07 1996-02-02 Keihin Seiki Mfg Co Ltd 電磁装置
JP2006202694A (ja) * 2005-01-24 2006-08-03 Koito Mfg Co Ltd 車両用前照灯
JP2012018862A (ja) * 2010-07-09 2012-01-26 Koito Mfg Co Ltd 車輌用前照灯
JP2012054150A (ja) * 2010-09-02 2012-03-15 Stanley Electric Co Ltd 自動車用前照灯
JP2017130456A (ja) * 2016-01-20 2017-07-27 アムエル システムズ ２つの空隙を有する電磁石によって作動される車両のヘッドライトのカットオフ機構
JP2018049730A (ja) * 2016-09-21 2018-03-29 株式会社小糸製作所 車両用前照灯

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0290503A (ja) * 1988-09-27 1990-03-30 Matsushita Electric Works Ltd 有極電磁石
JPH02170508A (ja) * 1988-12-23 1990-07-02 Matsushita Electric Works Ltd 有極電磁石装置
JPH0833303A (ja) * 1994-07-07 1996-02-02 Keihin Seiki Mfg Co Ltd 電磁装置
JP2006202694A (ja) * 2005-01-24 2006-08-03 Koito Mfg Co Ltd 車両用前照灯
JP2012018862A (ja) * 2010-07-09 2012-01-26 Koito Mfg Co Ltd 車輌用前照灯
JP2012054150A (ja) * 2010-09-02 2012-03-15 Stanley Electric Co Ltd 自動車用前照灯
JP2017130456A (ja) * 2016-01-20 2017-07-27 アムエル システムズ ２つの空隙を有する電磁石によって作動される車両のヘッドライトのカットオフ機構
JP2018049730A (ja) * 2016-09-21 2018-03-29 株式会社小糸製作所 車両用前照灯

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